Guillaume Genthial

Deploying Agents @ Sierra

Co-founder

Fragment· Summer 2023 🇫🇷 Paris, Île-de-France, France

in LinkedIn

2026Agent Engineer· Sierra

Founder · since 2023

Company

Sierra

Role

Agent Engineer

current

Stage

—

no public source

Raised

—

no public source

Based

—

Founder / co-founder — the company's markEmployee / research role

Source: LinkedIn work history

Profile coverage5 of 7 · missing posts, contact

Fragment

Turn manual operations into scalable processes

Summer 2023

Experience

Career

Sierra
Agent Engineer · 2026 – Present
2026
Fragment (YC S23)
Co-founder
Co-founder & CTO · 2023 – 2026
2023
MetaMap
AI Lead · Paris, Île-de-France, France · 2021 – 2022
2021
Criteo AI Lab
Senior Machine Learning Engineer · Paris, Île-de-France, France · 2019 – 2021
2019
Roam Analytics
NLP Engineer · San Mateo · 2018 – 2020
2018
Stanford Machine Learning Group
Research Assistant · 2017 – 2018
2017
Stanford University
Course Assistant · 2017 – 2018
2017
Proxem
Research Intern · Région de Paris, France · 2016
2016
Option
Web Developer · Santiago de Chile · 2015
2015
Marine Nationale
Internship · French Navy, patrol boat La Capricieuse, French Guyana, The Caribbean. · 2013 – 2014
2013

Bio

CTO @ Fragment, helping operations teams in FinTechs and InsurTech. Previously led the AI team of a KYC provider, developed software for human / AI workflows. As an engineer, I've worked on LLMs for healthcare, ad recommendation systems at scale @ Criteo, and OCR.